Swift Language

A comprehensive reference for modern Swift language features from 5.9 through 6.3. You get if/switch expressions, typed throws, result builders, property wrappers, and the some/any distinction explained clearly with working examples. Also covers Regex builders, Codable patterns with custom CodingKeys, modern collection methods like count(where:), and FormatStyle for dates and numbers. The examples are practical and the opaque vs existential types section actually clarifies when to use each. Use this when you're writing core Swift code with generics, protocols, or modern syntax and want to avoid the outdated patterns that still fill most tutorials. Deliberately excludes concurrency and SwiftUI, which have separate skills.

skills.sh installs: 4.1K
GitHub stars: 1.3K
last updated: Aug 21, 2026

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Install

$ npx -y skills add dpearson2699/swift-ios-skills --skill swift-language --agent claude-code

Installs into .claude/skills of the current project.

Files

Swift Language Patterns

Apply current Swift language syntax without changing behavior or evaluation order. Route deep decoding to swift-codable, formatting to swift-formatstyle, naming to swift-api-design-guidelines, concurrency to swift-concurrency, and SwiftUI state/view work to swiftui-patterns.

If/Switch Expressions
Typed Throws
Result Builders
Property Wrappers
Opaque and Existential Types
Guard Patterns
Never Type
Regex Builders
Codable Best Practices
Modern Collection APIs
FormatStyle
String Interpolation
Common Mistakes
Review Checklist
References

If/Switch Expressions

For modernization, pin current behavior and evaluation order, make one semantic rewrite, compile the affected module, and run focused fixtures/tests. Fix any change before continuing; repeat until behavior is preserved.

SKILL.md on GitHub